A plant or herb traditionally used in wedding decorations, ceremonies, or bridal garlands; possibly a historical term for specific flowering plants associated with brides.
From 'bride' and 'weed' (an archaic/dialectal term for plant or herb, not necessarily an unwanted plant). The exact plant species referred to is unclear, but such terms reflected the practice of adorning brides with specific flowers and herbs.
Medieval and early modern weddings involved elaborate knowledge about symbolic flowers and herbs—'brideweed' is probably a lost folk term for a specific plant, and its disappearance shows how specialized horticultural knowledge gets lost when cultural practices change and urbanization increases.
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